Product Description

**NOTE: Many Aftermarket drop in triggers use modified hammers which may not reset properly, or hit the firing pin square on the carrier which could cause firing pins to bind and snap. We recommend using only MILSPEC hammers with any 9mm, .40, or .45 blow back bolt carrier groups.

The New Frontier Armory AR-9 Modular 9mm Bolt Carrier Group is proudly MADE IN THE USA by hard working American men and women.